Re: [PATCH 3/5] staging: drivers: regulator: Add MAX77541 Regulator Support

[Jonathan Cameron <jic23@kernel.org>]

On Wed, 7 Dec 2022 12:08:42 +0300
Okan Sahin <okan.sahin@analog.com> wrote:

> This patch adds regulator driver for both MAX77541 and MAX77540.
> The MAX77541 is a high-efficiency step-down converter
> with two 3A switching phases for single-cell Li+ battery and 5VDC systems.
> 
> The MAX77540 is a high-efficiency step-down converter
> with two 3A switching phases.
> 
> Signed-off-by: Okan Sahin <okan.sahin@analog.com>

...

> +static int max77541_regulator_probe(struct platform_device *pdev)
> +{
> +	struct max77541_dev *max77541 = dev_get_drvdata(pdev->dev.parent);
> +	struct max77541_regulator_dev *regulator;
> +	struct regulator_config config = {};
> +	struct regulator_dev *rdev;
> +	int i;
> +
> +	regulator = devm_kzalloc(&pdev->dev, sizeof(*regulator), GFP_KERNEL);
> +	if (!regulator)
> +		return -ENOMEM;
> +
> +	regulator->dev = &pdev->dev;
> +	regulator->max77541 = max77541;
> +
> +	config.dev = pdev->dev.parent;
> +	config.driver_data = regulator;
> +	config.regmap = regulator->max77541->regmap;
> +
> +	for (i = 0; i < MAX77541_MAX_REGULATORS; i++) {
> +		switch (regulator->max77541->type) {
> +		case MAX77540:

As in mfd driver, better to move this from code to constant data
by using a chip_info type structure.  You could just use the
*_regulator_desc array, but probably better to wrap that in a structure
to reduce difficulty of adding other stuff in future.


> +			rdev = devm_regulator_register(&pdev->dev,
> +						       &max77540_regulators_desc[i], &config);
> +			if (IS_ERR(rdev))
> +				return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
> +							"Failed to register regulator\n");
> +			break;
> +		case MAX77541:
> +			rdev = devm_regulator_register(&pdev->dev,
> +						       &max77541_regulators_desc[i], &config);
> +			if (IS_ERR(rdev))
> +				return dev_err_probe(&pdev->dev, PTR_ERR(rdev),
> +						"Failed to register regulator\n");
> +			break;
> +		default:
> +			return -EINVAL;
> +		}
> +	}
> +
> +	return 0;
> +}